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. 2020 Nov 2;52(12):1423–1432. doi: 10.1038/s41588-020-00723-9

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Extended Data Fig. 1 — Comparison of 27-mer spectra between all paired-end reads (y-axis) and assemblies (x-axis) for the three apple accessions. Colors mark different copies of 27-mers in the genome assembly. The black area measures the proportion of 27-mers that were present in the sequencing reads but missing in the assemblies, which could be sequencing errors and contaminated sequences from organelles and microorganisms. The presence of a small portion of single-copy k-mer showing homozygous peak in the diploid assemblies could be due to: 1) the two alleles are nearly identical and were collapsed into one copy in the diploid assembly; and 2) the phased diploid assemblies are incomplete, with only one allele assembled for some loci.